Synthetic cast iron for production of hydraulic piece and preparation method thereof
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A technology for synthesizing cast iron and hydraulic parts, which is applied in the fields of casting and metallurgy, can solve the problems of insufficient research on the compactness of the internal structure, and achieve the effects of reducing shrinkage, reducing costs, and refining the body structure
Active Publication Date: 2008-04-16
CSIC NO 12 RES INST
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However, the technology mainly focuses on reducing the cost and improving the performance of the test rod, but...
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preparation example Construction
[0027] The preparation method of synthetic cast iron of the present invention, carries out according to the following steps,
[0028] a. Select the charge according to the following mass ratio
[0029] Scrap steel 50%~75%, requirements: 1) Composition C 0%~0.6%, Mn 0%~0.70%, Si 0%~1.0%, p≤0.04%, S≤0.04%; 2) Quality: no rust spots, No scale, no oil.
[0030] 10% to 30% of the returned charge, use the same grade.
[0031] Pig iron 10%-20%, its composition is Mn≥0.5%-0.80%, p≤0.05%, S≤0.02%, selected from Q10.
[0033] Ferrochrome and copper: selected from ferrochrome FeCr55C1000, copper (electrolytic red copper). Cr and Cu elements are added according to the required amount of calculation.
[0034] The chemical composition of controlled synthetic cast iron is: C 3.0%-3.3%, Si 1.8%-2.0%, Mn 0.4%-0.7%, Cr 0%-0.3%, Cu 0%-0.5%, and the rest is Fe.
[0035] b. Molten iron
[0036] Put t...
Embodiment
[0045] Using the method of the present invention to produce a certain type of diesel engine cylinder head
[0046] 1. The main technical requirements are as follows:
[0047] Technical requirements: single casting test bar requirements: Rm≥300Mpa; HB 230~260
[0048] Metallographic: pearlite ≥ 95%, graphite form: type A
[0049] Body performance requirements: Rm≥200Mpa
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Abstract
The invention discloses a synthetic cast iron for hydraulic member production, the mass percentage of the compositions is as follows: 1.8 percent to 3.3 percent of C, 1.8 percent to 2.0 percent of Si, 0.4 percent to 0.7 percent of Mn, 0 percent to 0.3 percent Cr, 0 percent to 0.5 percent of Cu and the rest is Fe. The percentage of the compositions of the charging is as follows: 50 percent to 75 percent of scrap steel, 10 percent to 30 percent of foundry returns, pig iron of 10 percent to 20 percent of pig iron and 1.5 percent to 2.6 percent of recarbonizer. The molten iron is added carbon at low temperature and compensated carbon at high temperature to reach the required ingredients during smelting. The invention can effectively remove the fault of shrinkage porosity inside the high strength gray cast iron; therefore the body strength is greatly improved. The invention has petty microscopic constitution and the casting has compact texture.
Description
technical field [0001] The invention belongs to the technical field of metallurgy and casting, and relates to a synthetic cast iron material used in the production of hydraulic parts, and also relates to a preparation method of the synthetic cast iron material. Background technique [0002] The complex key parts of ship power main and auxiliary systems, such as: cylinder head, controller, pump casing and other castings, have a very compact structure, a particularly complex inner cavity and a wide difference in wall thickness. The material design is mainly based on high-strength gray cast iron, and its acceptance criteria not only evaluate the performance of the test rod, but also include the microstructure, body performance and hydraulic test. Using traditional production methods, the graphite flakes in the casting structure are long and thick, resulting in low body performance and large differences between different parts, and shrinkage and porosity defects are easily gener...
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